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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Three long straight wires are connected parallel to each other across a battery of negligible internal resistance. The ratio of their resistances are 3 : 4 : 5. What is the ratio of distances of middle wire from the others if the net force experienced by it is zero |
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Answer» Three long straight wires are connected parallel to each other across a battery of negligible internal resistance. The ratio of their resistances are 3 : 4 : 5. What is the ratio of distances of middle wire from the others if the net force experienced by it is zero |
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| 2. |
A ray of light is fallingof refractive index \sqrt{}.such that theincident ray and the emergent ray, whenproduced, intersect at a point on thesurface of the sphere. Find the value ofangle of incidence in degree.on a glass sphere |
| Answer» A ray of light is fallingof refractive index \sqrt{}.such that theincident ray and the emergent ray, whenproduced, intersect at a point on thesurface of the sphere. Find the value ofangle of incidence in degree.on a glass sphere | |
| 3. |
11. Electrolysis is carried out in three cells (A) 1.0 M CuSO4 Pt electrode (B) 1.0 M CuSO4 copper electrodes (C) 1.0 M KCl Pt electrodes. If volume of electrolytic solution is maintained constant in each of the cells, what are the changes in pH that would take place in A, B, and C? |
| Answer» 11. Electrolysis is carried out in three cells (A) 1.0 M CuSO4 Pt electrode (B) 1.0 M CuSO4 copper electrodes (C) 1.0 M KCl Pt electrodes. If volume of electrolytic solution is maintained constant in each of the cells, what are the changes in pH that would take place in A, B, and C? | |
| 4. |
Frequency of oscillation of a body is 6 Hz when force F_1 is applied and 8 Hz when F_2 is applied. If both forces F_1 and F_2 are applied together, then find out the frequency of oscillation. |
| Answer» Frequency of oscillation of a body is 6 Hz when force F_1 is applied and 8 Hz when F_2 is applied. If both forces F_1 and F_2 are applied together, then find out the frequency of oscillation. | |
| 5. |
66.In a playground there is a merry-go-round of mass 120 kg and radius 4 m. The radius of gyration is 3m. A child of mass 30 kg runs at a speed of 5 m per second tangent to the rim of the merry-go-round when it is at rest and then jumps on it. Neglect friction and find the angular velocity of the merry-go-round and child (a) 0.2 rad /sec (b) 0.1 rad /sec (c) 0.4 rad /sec (d) 0.8 rad /sec |
| Answer» 66.In a playground there is a merry-go-round of mass 120 kg and radius 4 m. The radius of gyration is 3m. A child of mass 30 kg runs at a speed of 5 m per second tangent to the rim of the merry-go-round when it is at rest and then jumps on it. Neglect friction and find the angular velocity of the merry-go-round and child (a) 0.2 rad /sec (b) 0.1 rad /sec (c) 0.4 rad /sec (d) 0.8 rad /sec | |
| 6. |
Fill in the following blanks with suitable words : (a) Splitting of a heavy nucleus into two lighter nuclei is called ___ (b) Uranium-235 atoms will split when hit by ___ This is called ___ (c) Nuclear ___ is used in nuclear power stations for the production of electricity. (d) In a nuclear power station, nuclear fission takes place in the ___ |
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Answer» Fill in the following blanks with suitable words : |
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| 7. |
a large non_conducting plate has a charge q distributed uniformly over its surface. the electric fielsd just outside the plate is E . If the plate is repaced by an identical metallic oplate, what will be the field at the same point |
| Answer» a large non_conducting plate has a charge q distributed uniformly over its surface. the electric fielsd just outside the plate is E . If the plate is repaced by an identical metallic oplate, what will be the field at the same point | |
| 8. |
Name the device which converts sunlight into electricity. |
| Answer» Name the device which converts sunlight into electricity. | |
| 9. |
Question 32Write laws of refraction. Explain the same with the help of ray diagram, when a ray of light passes through a rectangular glass slab. |
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Answer» Question 32 |
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| 10. |
68.What's the magnitude of displacement of a particle moving in a circle of radius 'a' with constant angular speed (omega) varies with time 't'. |
| Answer» 68.What's the magnitude of displacement of a particle moving in a circle of radius 'a' with constant angular speed (omega) varies with time 't'. | |
| 11. |
A : A static magnetic field interacts with a moving charge and not with a stationary charge. R : A moving charge produces a magnetic field1. Both Assertion & Reason are true and the reason is the correct explanation of the assertion 2. Both Assertion & Reason are true but the reason is not the correct explanation of the assertion 3. Assertion is true statement but Reason is false 4. Both Assertion and Reason are false statements |
| Answer» A : A static magnetic field interacts with a moving charge and not with a stationary charge. R : A moving charge produces a magnetic field1. Both Assertion & Reason are true and the reason is the correct explanation of the assertion 2. Both Assertion & Reason are true but the reason is not the correct explanation of the assertion 3. Assertion is true statement but Reason is false 4. Both Assertion and Reason are false statements | |
| 12. |
A point source of light is kept at a distance of 15 cm from a converging lens, on its optical axis. The focal length of the lens is 10 cm and its diameter of aperture is 3 cm. A screen is placed on the other side of the lens, perpendicular to the axis of the lens, at a distance 20 cm from it. Find the area of the illuminated part of the screen. |
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Answer» A point source of light is kept at a distance of 15 cm from a converging lens, on its optical axis. The focal length of the lens is 10 cm and its diameter of aperture is 3 cm. A screen is placed on the other side of the lens, perpendicular to the axis of the lens, at a distance 20 cm from it. Find the area of the illuminated part of the screen. |
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| 13. |
Question 18 (c)Explain:(c) Why is the series arrangement not used for domestic circuits? |
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Answer» Question 18 (c) Explain: (c) Why is the series arrangement not used for domestic circuits? |
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| 14. |
Find out the distance of the image formed by the concave mirror from the pole, if the first image formed by the plane mirror is taken as an object for the given concave mirror. |
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Answer» Find out the distance of the image formed by the concave mirror from the pole, if the first image formed by the plane mirror is taken as an object for the given concave mirror.
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| 15. |
13.A bullet fired from a ggun experience a force of 600 - 2×100000t in barrel of gun Here t is in second The force become 0 as soon as bullet leave the barrel of the gun The time which was bullet in the barrel of the gum |
| Answer» 13.A bullet fired from a ggun experience a force of 600 - 2×100000t in barrel of gun Here t is in second The force become 0 as soon as bullet leave the barrel of the gun The time which was bullet in the barrel of the gum | |
| 16. |
A synchronous generator having synchronous reactance of 1.0 pu is connected to infinite busbar of 1.0 p.u voltage through 2 parallel lines each of 0.5 p.u. reactance. The generator excitation when it is delivering zero active power and 0.5 pu lagging reactive power to the infinite busbars is____ p.u.1.62 |
Answer» A synchronous generator having synchronous reactance of 1.0 pu is connected to infinite busbar of 1.0 p.u voltage through 2 parallel lines each of 0.5 p.u. reactance. The generator excitation when it is delivering zero active power and 0.5 pu lagging reactive power to the infinite busbars is____ p.u.
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| 17. |
You are given kerosene glycerine and water so in which of these light travels fastest and in which it bends more towards normal |
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Answer» You are given kerosene glycerine and water so in which of these light travels fastest and in which it bends more towards normal |
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| 18. |
The nth harmonic of a closed organ pipe is equal to then mth harmonic of an open pipe. The first overtone frequency of the closed organ pipe is also equal to the first overtone frequency of the open organ pipe. Find the value of n if m=6. |
| Answer» The nth harmonic of a closed organ pipe is equal to then mth harmonic of an open pipe. The first overtone frequency of the closed organ pipe is also equal to the first overtone frequency of the open organ pipe. Find the value of n if m=6. | |
| 19. |
The I-V graph shown in the figure is plotted for the different wires of the same material and of equal cross-sectional area. Which of the wire is longest among them? |
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Answer» The I-V graph shown in the figure is plotted for the different wires of the same material and of equal cross-sectional area. Which of the wire is longest among them? |
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| 20. |
What would be the refractive index of the liquid in the given figure? |
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Answer» What would be the refractive index of the liquid in the given figure? |
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| 21. |
electrons revovle in clock wise and anti clock wise ina energy level . if we take 1s orbital it consists of 2 electrons revolving anti clockwise and clockwise , wont they hit each other when the revolve? |
| Answer» electrons revovle in clock wise and anti clock wise ina energy level . if we take 1s orbital it consists of 2 electrons revolving anti clockwise and clockwise , wont they hit each other when the revolve? | |
| 22. |
When the current in a conductor is doubled, the power dissipiated increases by_____times.4 |
Answer» When the current in a conductor is doubled, the power dissipiated increases by_____times.
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| 23. |
A particle is projected from ground with speed 80m/s at an angle 30 degrees with horizontal from ground .the magnitude of average velocity in time interval t=2s to t=6s is |
| Answer» A particle is projected from ground with speed 80m/s at an angle 30 degrees with horizontal from ground .the magnitude of average velocity in time interval t=2s to t=6s is | |
| 24. |
2 capacitor A of 3 micro Farad and B of 2 microfarad are connected in series. A can with stand a potential difference of 3 kilovolt while B can with stand 5 kilovolt. what maximum potential difference can be applied across the combination? 1. 8kV 2. 6kV 3. 7.5kV 4. 8.3kV |
| Answer» 2 capacitor A of 3 micro Farad and B of 2 microfarad are connected in series. A can with stand a potential difference of 3 kilovolt while B can with stand 5 kilovolt. what maximum potential difference can be applied across the combination? 1. 8kV 2. 6kV 3. 7.5kV 4. 8.3kV | |
| 25. |
How is an electromagnet made? List any two uses of an electromagnet. |
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Answer» How is an electromagnet made? List any two uses of an electromagnet. |
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| 26. |
In which of the following cases least force is required to lift the block? |
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Answer» In which of the following cases least force is required to lift the block? |
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| 27. |
What is the value of x in the figure shown? |
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Answer» What is the value of x in the figure shown?
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| 28. |
ntTwo short magnets apply a force F on each other . if the separation between them is halved then the new force is?n |
| Answer» ntTwo short magnets apply a force F on each other . if the separation between them is halved then the new force is?n | |
| 29. |
Two spherical mirrors (convex and concave) having the same focal length of36 cm are arranged so that their optical axes coincide. The separation between the mirrors is 1 m. At what distance from the concave mirror should an object be placed so that its images formed by the concave and convex mirror independently are identical in size? (A) 86 cm in front of concave mirror (B) 76 cm in front of the concave mirror (C) 56 cm in front of concave mirror (D) None of these |
| Answer» Two spherical mirrors (convex and concave) having the same focal length of36 cm are arranged so that their optical axes coincide. The separation between the mirrors is 1 m. At what distance from the concave mirror should an object be placed so that its images formed by the concave and convex mirror independently are identical in size? (A) 86 cm in front of concave mirror (B) 76 cm in front of the concave mirror (C) 56 cm in front of concave mirror (D) None of these | |
| 30. |
With the help of a ray diagram, determine the position, nature and size of the image formed of an object placed at the centre of curvature of a concave mirror. |
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Answer» With the help of a ray diagram, determine the position, nature and size of the image formed of an object placed at the centre of curvature of a concave mirror. |
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| 31. |
What is the horiontal field of view for a single-eyed human? |
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Answer» What is the horiontal field of view for a single-eyed human? |
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| 32. |
Heat of combustion for C(s), H2(g) and CH (g) are-94, -68 and -213 kcal/mol, then AH forC(s) + 2H2(g)CH2(g) is4(1) -17 kcal(2) -111 kcal(4) -85 kcal(3) -170 kcal |
| Answer» Heat of combustion for C(s), H2(g) and CH (g) are-94, -68 and -213 kcal/mol, then AH forC(s) + 2H2(g)CH2(g) is4(1) -17 kcal(2) -111 kcal(4) -85 kcal(3) -170 kcal | |
| 33. |
In a DC motor, the device which is used to change the direction of current through the coil after every half rotation is called ___. |
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Answer» In a DC motor, the device which is used to change the direction of current through the coil after every half rotation is called ___. |
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| 34. |
An object is placed at 60 cm from the pole of a concave mirror whose focal length is 20 cm. Find the distance at which the image is formed. |
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Answer» An object is placed at 60 cm from the pole of a concave mirror whose focal length is 20 cm. Find the distance at which the image is formed. |
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| 35. |
6.106.2g 1 molal aqueous solution of ethylene glycol is cooled to -3.72 C. Mass of ice seperated during cooling is (Kf water=1.86, freezing point of water = 0 C) a)25 g b)50g c)60g d)40g |
| Answer» 6.106.2g 1 molal aqueous solution of ethylene glycol is cooled to -3.72 C. Mass of ice seperated during cooling is (Kf water=1.86, freezing point of water = 0 C) a)25 g b)50g c)60g d)40g | |
| 36. |
What is the value of electrostatic constant K |
| Answer» What is the value of electrostatic constant K | |
| 37. |
The distance between an object and a convex lens is changing, and it is noticed that the size of the image formed on a screen is decreasing. Is the object moving in a direction towards the lens or away from it? |
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Answer» The distance between an object and a convex lens is changing, and it is noticed that the size of the image formed on a screen is decreasing. Is the object moving in a direction towards the lens or away from it? |
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| 38. |
four identical thin lenses are kept one beside the other on the same optical axis . the right surface of rightmost lens is silvered . focal length of each lens is 20cm and radius of the silvered surface is 20cm. the focal length of combined system is ? |
| Answer» four identical thin lenses are kept one beside the other on the same optical axis . the right surface of rightmost lens is silvered . focal length of each lens is 20cm and radius of the silvered surface is 20cm. the focal length of combined system is ? | |
| 39. |
Causes of Short circuit and overloading? |
| Answer» Causes of Short circuit and overloading? | |
| 40. |
How does calcium has 8 electrons instead of 10 electrons in its third orbit as the the third orbit can hold a maximum of 18 electrons? |
| Answer» How does calcium has 8 electrons instead of 10 electrons in its third orbit as the the third orbit can hold a maximum of 18 electrons? | |
| 41. |
Find the image velocity in the given diagram. |
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Answer» Find the image velocity in the given diagram. |
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| 42. |
How is the critical angle related to the refractive index of a medium? |
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Answer» How is the critical angle related to the refractive index of a medium? |
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| 43. |
A symmetric biconvex lens of radius of curvature R and made of glass of refractive index 1.5, is placed on a layer of liquid placed on top of a plane mirror as shown in the figure. An optical needle with its tip on the principal axis of the lens is moved along the axis until its real, inverted image coincides with the needle itself. The dis†an ce of the needle from the lens is measured to be x. On removing the liquid layer and repeating the experiment, the dis†an ce is found to be y. Obtain the expression for the refractive index of the liquid in terms of x and y. |
| Answer» A symmetric biconvex lens of radius of curvature R and made of glass of refractive index 1.5, is placed on a layer of liquid placed on top of a plane mirror as shown in the figure. An optical needle with its tip on the principal axis of the lens is moved along the axis until its real, inverted image coincides with the needle itself. The dis†an ce of the needle from the lens is measured to be x. On removing the liquid layer and repeating the experiment, the dis†an ce is found to be y. Obtain the expression for the refractive index of the liquid in terms of x and y. | |
| 44. |
A string under tension of 129.6N produces 10beats/s when it is vibrated along with a tuning fork. When the tension in the string is increased to 160 N it sounds in unison with same tuning fork .calculate fundamental freq. Of tuning fork ? |
| Answer» A string under tension of 129.6N produces 10beats/s when it is vibrated along with a tuning fork. When the tension in the string is increased to 160 N it sounds in unison with same tuning fork .calculate fundamental freq. Of tuning fork ? | |
| 45. |
A copper wire of resistance 10 ohm is in the form of a perfect circle. Two points A and B on it are connected to a battery of emf 5 V and internal resistance 0.5 ohm . The two segments of the circle have lengths in the ratio 2 : 3. The net magnetic induction at the centre of the circle is |
| Answer» A copper wire of resistance 10 ohm is in the form of a perfect circle. Two points A and B on it are connected to a battery of emf 5 V and internal resistance 0.5 ohm . The two segments of the circle have lengths in the ratio 2 : 3. The net magnetic induction at the centre of the circle is | |
| 46. |
A point source O is placed at a distance of 12.5 cm from a converging lens of focal length 10 cm, on its principal axis as shown in tr e figure. Find the distance at which a diverging mirror of tocal length 20 cm should be placed, so that a real image is formed on the source itself. |
| Answer» A point source O is placed at a distance of 12.5 cm from a converging lens of focal length 10 cm, on its principal axis as shown in tr e figure. Find the distance at which a diverging mirror of tocal length 20 cm should be placed, so that a real image is formed on the source itself. | |
| 47. |
I series combination of resistances: (a) p.d. i same across each resistance (b) total resistance is reduced (c) current is same in each resistance (d) all above are true. |
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Answer» I series combination of resistances: |
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| 48. |
In which direction does the wire move if the current flows through the wire in the downward direction? |
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Answer» In which direction does the wire move if the current flows through the wire in the downward direction? |
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| 49. |
The Earth is assumed to be a sphere of radius R. A platform is arranged at a height R from the surface of the Earth. The escape velocity of a body from this platform is fv, where v is its escape velocity from the surface of the Earth. The value of f is |
| Answer» The Earth is assumed to be a sphere of radius R. A platform is arranged at a height R from the surface of the Earth. The escape velocity of a body from this platform is fv, where v is its escape velocity from the surface of the Earth. The value of f is | |
| 50. |
A nucleus at rest splits into two nuclear parts having radii in the ratio 1: 2. Their velocities are in the ratio: |
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Answer» A nucleus at rest splits into two nuclear parts having radii in the ratio 1: 2. Their velocities are in the ratio: |
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